import random
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html

# from scrapy import signals
#
# # useful for handling different item types with a single interface
# from itemadapter import ItemAdapter
# from fake_useragent import UserAgent
#
# ua = UserAgent()
# cookies= ['skjdfk1','lakshdfklas2','alskdfjlksajhdf3']
# class ScrapyUaMiddleware:
#
#     @classmethod
#     def from_crawler(cls, crawler):
#         # This method is used by Scrapy to create your spiders.
#         s = cls()
#         crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
#         return s
#
#     def process_request(self, request, spider):
#         print('111')
#         request.headers['user-agent']=ua.random
#         request.headers['cookies']=f'sessionid={random.choice(cookies)}'
#
#         return None
#
#     def process_response(self, request, response, spider):
#         print('222')
#         return response
#
#     def spider_opened(self, spider):
#          spider.logger.info("Spider opened: %s" % spider.name)
#
#
#


#
# class ScrapyzzfSpiderMiddleware:
#     # Not all methods need to be defined. If a method is not defined,
#     # scrapy acts as if the spider middleware does not modify the
#     # passed objects.
#
#     @classmethod
#     def from_crawler(cls, crawler):
#         # This method is used by Scrapy to create your spiders.
#         s = cls()
#         crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
#         return s
#
#     def process_spider_input(self, response, spider):
#         # Called for each response that goes through the spider
#         # middleware and into the spider.
#
#         # Should return None or raise an exception.
#         return None
#
#     def process_spider_output(self, response, result, spider):
#         # Called with the results returned from the Spider, after
#         # it has processed the response.
#
#         # Must return an iterable of Request, or item objects.
#         for i in result:
#             yield i
#
#     def process_spider_exception(self, response, exception, spider):
#         # Called when a spider or process_spider_input() method
#         # (from other spider middleware) raises an exception.
#
#         # Should return either None or an iterable of Request or item objects.
#         pass
#
#     async def process_start(self, start):
#         # Called with an async iterator over the spider start() method or the
#         # maching method of an earlier spider middleware.
#         async for item_or_request in start:
#             yield item_or_request
#
#     def spider_opened(self, spider):
#         spider.logger.info("Spider opened: %s" % spider.name)

#
# class ScrapyzzfDownloaderMiddleware:
#     # Not all methods need to be defined. If a method is not defined,
#     # scrapy acts as if the downloader middleware does not modify the
#     # passed objects.
#
#     @classmethod
#     def from_crawler(cls, crawler):
#         # This method is used by Scrapy to create your spiders.
#         s = cls()
#         crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
#         return s
#
#     def process_request(self, request, spider):
#         # Called for each request that goes through the downloader
#         # middleware.
#
#         # Must either:
#         # - return None: continue processing this request
#         # - or return a Response object
#         # - or return a Request object
#         # - or raise IgnoreRequest: process_exception() methods of
#         #   installed downloader middleware will be called
#         return None
#
#     def process_response(self, request, response, spider):
#         # Called with the response returned from the downloader.
#
#         # Must either;
#         # - return a Response object
#         # - return a Request object
#         # - or raise IgnoreRequest
#         return response
#
#     def process_exception(self, request, exception, spider):
#         # Called when a download handler or a process_request()
#         # (from other downloader middleware) raises an exception.
#
#         # Must either:
#         # - return None: continue processing this exception
#         # - return a Response object: stops process_exception() chain
#         # - return a Request object: stops process_exception() chain
#         pass
#
#     def spider_opened(self, spider):
#         spider.logger.info("Spider opened: %s" % spider.name)




# ip池使用
# from log.ip import get_ip_requests,get_ip_poll
# from scrapy.core.downloader.handlers.http11 import TunnelError
#
#
# class ipMiddleware:
#     @classmethod
#     def from_crawler(cls, crawler):
#         # This method is used by Scrapy to create your spiders.
#         s = cls()
#         s.proxy_poll = get_ip_poll(5)
#         return s
#
#     def process_request(self, request, spider):
#         ip = random.choice(self.proxy_poll)
#
#         request.meta['proxy'] = ip['http']
#         request.meta['ip'] = ip
#         print(f"使用的IP是------  {ip['http']}")
#
#         return None
#
#     def process_response(self, request, response, spider):
#         return response
#
#
#     def process_exception(self, request, exception, spider):
#            if isinstance(exception, TunnelError):
#                ip = request.meta['ip']
#                print(f'ip过期了 ---{ip}')
#
#                #
#                if ip in self.proxy_poll:
#                    self.proxy_poll.remove(ip)
#                    self.proxy_poll.append(get_ip_poll(1))
#
#                if len(self.proxy_poll) == 0:
#                    self.proxy_poll.append(get_ip_poll(1))
#
#                ip = random.choice(self.proxy_poll)
#                print(f"使用的IP是------  {ip['http']}")
#                request.meta['proxy'] = ip['http']
#                request.meta['ip'] = ip
#                print('发起请求-----')
#                return request



#!/usr/bin/env Python
# -*- coding: utf-8 -*-



# 隧道域名:端口号
tunnel = "h560.kdltpspro.com:15818"

# 用户名密码方式
username = "t16308821704879"
password = "7cv5nz3m"



class ipMiddleware:

    def process_request(self, request, spider):
       request.meta['proxy'] = "http://%(user)s:%(pwd)s@%(proxy)s/" % {"user": username, "pwd": password, "proxy": tunnel}


    def process_response(self, request, response, spider):
        return response


